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Abstract

From Huygens-Fresnel integral in cylindrical coordinates and by
conveniently choosing the phase function from energy considerations, we
demonstrate the possibility of approximately achieving and almost freely
chosen longitudinal intensity profile along the optical axis for Free Space
Optics (FSO) using a simple theory. These phase functions represent optical
elements that could be coupled to the transmitter and, in the case of this
work, it is shown that axicons and gradient-index (GRIN) axicons, which are
commercially available and cost-effective, can be easily designed for
applications in FSO systems to overcome diffraction and possible atmospheric
attenuations, to increase the link distance or to diminish the power
emitted.

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